CV

Education

• PhD in Economic History, LSE, Summer 2026 (expected)
• MPhil in Sociology and Demography, University of Oxford, 2023
• BA in Human Sciences, University of Oxford, 2021

Academic positions

• Oslo Metropolitan University
  • Research Fellow (Forsker III), Centre for Pandemics & Society (PANSOC), January–December 2024

Academic affiliations

• Leverhulme Centre for Demographic Science, University of Oxford, July 2025–
• Centre for Advanced Study at the Norwegian Academy of Science and Letters, Short-term Residential Fellow, November–December 2025

Teaching positions

• University of Oxford
  • Instructor for “Demography and Population” (BA Human Sciences & BA Philosophy, Politics, and Economics), 2022–
  • Instructor for “Introduction to Demography” (BA Human Sciences), 2023

Publications

1. Gaddy, H., Sear, R., & Fortunato, L. (2025). High rates of polygyny do not lock large proportions of men out of the marriage market. PNAS, 122(40): e2508091122. doi:10.1073/pnas.2508091122
2. Blinkova, A.O., Khakurel, U., Gaddy, H., Mamelund, S.-E., & Bekker-Nielsen Dunbar, M. (2025). Construction and curation of a data set of historical mental health incidence in Norway. Scientific Data 12: 1510. doi:10.1038/s41597-025-05795-y
3. Gaddy, H., & Gargiulo, M. (2025). Can we estimate crisis death tolls by subtracting total population estimates? A critical review and appraisal. Demographic Research, 52: 741–796. doi:10.4054/DemRes.2025.52.23
4. Gaddy, H., & Mølbak Ingholt, M. (2024). Did the 1918 pandemic cause a 1920 baby boom? Demographic evidence from neutral Europe. Population Studies, 78: 269–287. doi:10.1080/00324728.2023.2192041
5. Gaddy, H. (2021). Social distancing and influenza mortality in 1918 did not increase suicide rates in the United States. SSM – Population Health, 6: 100944. doi:10.1016/j.ssmph.2021.100944
6. Gaddy, H. (2021). A decade of TFR declines suggests no relationship between development and sub-replacement fertility rebounds. Demographic Research 44: 125–142. doi:10.4054/DemRes.2021.44.5
7. Gaddy, H. (2020). Brexit and the geography of depression. Social Science & Medicine 264: 113276. doi:10.1016/j.socscimed.2020.113276
8. Gaddy, H. (2020). Using local knowledge in emerging infectious disease research. Social Science & Medicine 258: 113107. doi:10.1016/j.socscimed.2020.113107

Awards and grants

• IPUMS Research Award for Best Paper by a Student using IPUMS International Data (co-recipient), Institute for Social Research and Data Innovation, University of Minnesota, 2026
• LSE PhD Studentship, London School of Economics, 2023–28
• Roger Schofield Award for Best Paper by a Young Demographer, European Society of Historical Demography, 2022
• Grand Union Doctoral Training Partnership Scholarship, Economic and Social Research Council (ESRC) and Nuffield College, Oxford, 2021–23
• Wilma Crowther Prize for Best Undergraduate Dissertation, Institute of Human Sciences, Oxford, 2021
• Demyship (highest undergraduate prize), Magdalen College, Oxford, 2020

Other employment

• Calleva Research Centre, Magdalen College, University of Oxford
  • Administrative assistant, 2023–
• Magdalen College, University of Oxford
  • BA Human Sciences admissions interviewer, 2023
• Centre for Experimental Social Sciences, University of Oxford
  • Laboratory assistant, 2022–23

Service

• Current positions
  • LSE Historical Economic Demography Group, Advisory Board Member, 2025–
  • Association of Young Historical Demographers, Board member, 2024–
  • GreatLeap, COST Management Committee member, 2023–
• Conference organisation
  • European Society of Historical Demography (ESHD), Session chair (2025)
  • European Social Science History Conference (ESSHC), Session organiser and discussant (2025)
  • PopFest, Historical Demography strand co-organiser (2025)
  • British Society of Population Studies (BSPS), Session chair (2024; 2022 x 2)
• Peer review
  • Field: Demography — Demography (2), Population Studies (2), Population and Development Review (1), Population Research and Policy Review (1), Canadian Studies in Population (1), Journal of Comparative Family Studies (1), Journal of Population Ageing (1), Humanities & Social Sciences Communications (1)
  • Field: Epidemiology and public health — International Journal of Epidemiology (1), Journal of Epidemiology and Global Health (1), npj Schizophrenia (1), Violence Against Women (1), Discover Public Health (1), EcoHealth (1), Czech Science Foundation (1), Human Ecology (1), Ethnobiology and Conservation (1)